advanceheating wrote:
Yes, this ring fencing of files to exist only within their associated apps is really annoying
This is also ("sandboxing" of the operating system) a central core feature of iOS since it's inception. The sandbox operating system model is a core component of the whole iOS security model. Since an app cannot access another's file space, malicious software cannot propagate nor gain control of a device or its software.
iOS itself, and its own core apps (photos, calendar, contacts, etc) can pass data to other apps that request it. For example, only iOS itself has access to the aGPS system. Other location based apps only get location information by requesting it from iOS's location services component.
The sandboxed nature of iOS is never going to change as it is a deliberate design choice by Apple. To date, there is no known malware or other malicious exploits in the wild for iOS 9.3.5 or newer. There are many known malicious exploits in circulation for Android.
All that said, yes, for a great many tasks or work flows, an iOS device is no replacement for a laptop or desktop computer and their software. I know I could not do my work exclusively on an iPad. Although it is very useful for many things, it cannot replace my computers.